Tsev - Cov khoom -

Cov cuab yeej pabcuam

Optical Rail
Cov kab hluav taws xob kho qhov muag no tsim nyog rau ntau yam kev sim kho qhov muag
Optical Saddle
Cov eeb kho qhov muag no yog siv los txhawb qhov kev tso kawm thiab kev txav ntawm ntau yam khoom siv kho qhov muag ntawm qhov kho qhov muag.